Chen Jian, Zhang Shuai, Pan Xin, Li Ruiqian, Ye Shi, Cheetham Anthony K, Mao Lingling
Department of Chemistry, Southern University of Science and Technology, Shenzhen, Guangdong 518055, China.
State Key Laboratory of Luminescent Materials and Devices, South China University of Technology, Guangzhou, Guangdong 510641, China.
Angew Chem Int Ed Engl. 2022 Jul 25;61(30):e202205906. doi: 10.1002/anie.202205906. Epub 2022 May 25.
Chiral hybrid metal halides with a high dissymmetry factor (g ) and a superior photoluminescence quantum yield (PLQY) are promising candidates for circularly polarized luminescence (CPL) light sources. Here, we report eight new chiral hybrid manganese halides, crystallizing in the non-centrosymmetric space group P2 2 2 and showing intense CPL emissions. Oppositely-signed circular dichroism (CD) and CPL signals are detected according to the R- and S-configurations of the chiral alkanolammonium cations. Time-resolved PL spectra show long averaged decay lifetimes up to 1 ms for (R-3-quinuclidinol)MnBr (R-1). The g of polycrystalline samples for coordinated structures (23×10 ) is more than doubled compared with the non-coordinated ones (8.5×10 ), due to the structural variations. R-1 exhibit both a high g and a high PLQY (50.2 %). The effective chirality transfer mechanism through coordination bonds, with strongly emissive Mn centers, enables a new class of high-performance CPL materials.
具有高不对称因子（g）和优异光致发光量子产率（PLQY）的手性杂化金属卤化物是圆偏振发光（CPL）光源的有前途的候选材料。在此，我们报道了八种新的手性杂化锰卤化物，它们结晶于非中心对称空间群P2 2 2且显示出强烈的CPL发射。根据手性链烷醇铵阳离子的R-和S-构型检测到相反符号的圆二色性（CD）和CPL信号。时间分辨PL光谱显示，对于（R-3-奎宁环醇）MnBr（R-1），平均衰减寿命长达1 ms。由于结构变化，配位结构的多晶样品的g（23×10）比未配位的样品（8.5×10）增加了一倍多。R-1同时具有高g和高PLQY（50.2%）。通过配位键的有效手性转移机制以及强发射性的Mn中心，使得一类新型高性能CPL材料成为可能。
